summaryrefslogtreecommitdiffstats
path: root/recipes-kernel/hdm-usb
diff options
context:
space:
mode:
authorChristian Gromm <christian.gromm@microchip.com>2015-12-16 13:42:25 +0100
committerGerrit Code Review <gerrit@172.30.200.200>2015-12-21 14:23:03 +0000
commit45e14d9435eef26cb8afb152a56d9f303192fbdd (patch)
treef070a5714a55d09479800110ba219a16c0fb9b2e /recipes-kernel/hdm-usb
parent565235cf6861f03a8d9d6b2613213509949b44d9 (diff)
recipes-kernel: add MOST driver kernel modules
This commit adds the recipes-kernel directory to the meta-agl-demo layer. It is needed to add the MOST driver to the AGL layer and have it compiled as out-of-tree modules. Change-Id: I38174a2f9a59b0424cfaf2f85f059550422f58f2 Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Diffstat (limited to 'recipes-kernel/hdm-usb')
-rw-r--r--recipes-kernel/hdm-usb/files/COPYING340
-rw-r--r--recipes-kernel/hdm-usb/files/Makefile17
-rw-r--r--recipes-kernel/hdm-usb/files/hdm_usb.c1438
-rw-r--r--recipes-kernel/hdm-usb/hdm-usb.bb22
4 files changed, 1817 insertions, 0 deletions
diff --git a/recipes-kernel/hdm-usb/files/COPYING b/recipes-kernel/hdm-usb/files/COPYING
new file mode 100644
index 000000000..6d45519c8
--- /dev/null
+++ b/recipes-kernel/hdm-usb/files/COPYING
@@ -0,0 +1,340 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+ 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
+
+ The licenses for most software are designed to take away your
+freedom to share and change it. By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users. This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it. (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.) You can apply it to
+your programs, too.
+
+ When we speak of free software, we are referring to freedom, not
+price. Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+ To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+ For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have. You must make sure that they, too, receive or can get the
+source code. And you must show them these terms so they know their
+rights.
+
+ We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+ Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software. If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+ Finally, any free program is threatened constantly by software
+patents. We wish to avoid the danger that redistributors of a free
+program will individually obtain patent licenses, in effect making the
+program proprietary. To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+ The precise terms and conditions for copying, distribution and
+modification follow.
+
+ GNU GENERAL PUBLIC LICENSE
+ TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+ 0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License. The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language. (Hereinafter, translation is included without limitation in
+the term "modification".) Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope. The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+ 1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+ 2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+ a) You must cause the modified files to carry prominent notices
+ stating that you changed the files and the date of any change.
+
+ b) You must cause any work that you distribute or publish, that in
+ whole or in part contains or is derived from the Program or any
+ part thereof, to be licensed as a whole at no charge to all third
+ parties under the terms of this License.
+
+ c) If the modified program normally reads commands interactively
+ when run, you must cause it, when started running for such
+ interactive use in the most ordinary way, to print or display an
+ announcement including an appropriate copyright notice and a
+ notice that there is no warranty (or else, saying that you provide
+ a warranty) and that users may redistribute the program under
+ these conditions, and telling the user how to view a copy of this
+ License. (Exception: if the Program itself is interactive but
+ does not normally print such an announcement, your work based on
+ the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole. If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works. But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+ 3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+ a) Accompany it with the complete corresponding machine-readable
+ source code, which must be distributed under the terms of Sections
+ 1 and 2 above on a medium customarily used for software interchange; or,
+
+ b) Accompany it with a written offer, valid for at least three
+ years, to give any third party, for a charge no more than your
+ cost of physically performing source distribution, a complete
+ machine-readable copy of the corresponding source code, to be
+ distributed under the terms of Sections 1 and 2 above on a medium
+ customarily used for software interchange; or,
+
+ c) Accompany it with the information you received as to the offer
+ to distribute corresponding source code. (This alternative is
+ allowed only for noncommercial distribution and only if you
+ received the program in object code or executable form with such
+ an offer, in accord with Subsection b above.)
+
+The source code for a work means the preferred form of the work for
+making modifications to it. For an executable work, complete source
+code means all the source code for all modules it contains, plus any
+associated interface definition files, plus the scripts used to
+control compilation and installation of the executable. However, as a
+special exception, the source code distributed need not include
+anything that is normally distributed (in either source or binary
+form) with the major components (compiler, kernel, and so on) of the
+operating system on which the executable runs, unless that component
+itself accompanies the executable.
+
+If distribution of executable or object code is made by offering
+access to copy from a designated place, then offering equivalent
+access to copy the source code from the same place counts as
+distribution of the source code, even though third parties are not
+compelled to copy the source along with the object code.
+
+ 4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License. Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+ 5. You are not required to accept this License, since you have not
+signed it. However, nothing else grants you permission to modify or
+distribute the Program or its derivative works. These actions are
+prohibited by law if you do not accept this License. Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+ 6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
+these terms and conditions. You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+this License.
+
+ 7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License. If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all. For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
+circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices. Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+ 8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded. In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+ 9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time. Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number. If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation. If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+ 10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission. For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this. Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+ NO WARRANTY
+
+ 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+ 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+ Gnomovision version 69, Copyright (C) year name of author
+ Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary. Here is a sample; alter the names:
+
+ Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+ `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+ <signature of Ty Coon>, 1 April 1989
+ Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs. If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library. If this is what you want to do, use the GNU Library General
+Public License instead of this License.
diff --git a/recipes-kernel/hdm-usb/files/Makefile b/recipes-kernel/hdm-usb/files/Makefile
new file mode 100644
index 000000000..0714f6b73
--- /dev/null
+++ b/recipes-kernel/hdm-usb/files/Makefile
@@ -0,0 +1,17 @@
+# Makefile
+#
+
+SRC := $(shell pwd)
+
+obj-m += hdm_usb.o
+CFLAGS_hdm_usb.o := -I$(src)/../../aim-network/files/ -I$(src)/../../mostcore/files
+
+all:
+ $(MAKE) -C $(KERNEL_SRC) M=$(SRC) modules
+
+modules_install:
+ $(MAKE) -C $(KERNEL_SRC) M=$(SRC) modules_install
+
+clean:
+ $(MAKE) -C $(KERNEL_SRC) M=$(SRC) clean
+
diff --git a/recipes-kernel/hdm-usb/files/hdm_usb.c b/recipes-kernel/hdm-usb/files/hdm_usb.c
new file mode 100644
index 000000000..41690f801
--- /dev/null
+++ b/recipes-kernel/hdm-usb/files/hdm_usb.c
@@ -0,0 +1,1438 @@
+/*
+ * hdm_usb.c - Hardware dependent module for USB
+ *
+ * Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * This file is licensed under GPLv2.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/usb.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/cdev.h>
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/completion.h>
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/sysfs.h>
+#include <linux/dma-mapping.h>
+#include <linux/etherdevice.h>
+#include <linux/uaccess.h>
+#include "mostcore.h"
+#include "networking.h"
+
+#define USB_MTU 512
+#define NO_ISOCHRONOUS_URB 0
+#define AV_PACKETS_PER_XACT 2
+#define BUF_CHAIN_SIZE 0xFFFF
+#define MAX_NUM_ENDPOINTS 30
+#define MAX_SUFFIX_LEN 10
+#define MAX_STRING_LEN 80
+#define MAX_BUF_SIZE 0xFFFF
+#define CEILING(x, y) (((x) + (y) - 1) / (y))
+
+#define USB_VENDOR_ID_SMSC 0x0424 /* VID: SMSC */
+#define USB_DEV_ID_BRDG 0xC001 /* PID: USB Bridge */
+#define USB_DEV_ID_INIC 0xCF18 /* PID: USB INIC */
+#define HW_RESYNC 0x0000
+/* DRCI Addresses */
+#define DRCI_REG_NI_STATE 0x0100
+#define DRCI_REG_PACKET_BW 0x0101
+#define DRCI_REG_NODE_ADDR 0x0102
+#define DRCI_REG_NODE_POS 0x0103
+#define DRCI_REG_MEP_FILTER 0x0140
+#define DRCI_REG_HASH_TBL0 0x0141
+#define DRCI_REG_HASH_TBL1 0x0142
+#define DRCI_REG_HASH_TBL2 0x0143
+#define DRCI_REG_HASH_TBL3 0x0144
+#define DRCI_REG_HW_ADDR_HI 0x0145
+#define DRCI_REG_HW_ADDR_MI 0x0146
+#define DRCI_REG_HW_ADDR_LO 0x0147
+#define DRCI_REG_BASE 0x1100
+#define DRCI_COMMAND 0x02
+#define DRCI_READ_REQ 0xA0
+#define DRCI_WRITE_REQ 0xA1
+
+/**
+ * struct buf_anchor - used to create a list of pending URBs
+ * @urb: pointer to USB request block
+ * @clear_work_obj:
+ * @list: linked list
+ * @urb_completion:
+ */
+struct buf_anchor {
+ struct urb *urb;
+ struct work_struct clear_work_obj;
+ struct list_head list;
+ struct completion urb_compl;
+};
+
+#define to_buf_anchor(w) container_of(w, struct buf_anchor, clear_work_obj)
+
+/**
+ * struct most_dci_obj - Direct Communication Interface
+ * @kobj:position in sysfs
+ * @usb_device: pointer to the usb device
+ */
+struct most_dci_obj {
+ struct kobject kobj;
+ struct usb_device *usb_device;
+};
+
+#define to_dci_obj(p) container_of(p, struct most_dci_obj, kobj)
+
+/**
+ * struct most_dev - holds all usb interface specific stuff
+ * @parent: parent object in sysfs
+ * @usb_device: pointer to usb device
+ * @iface: hardware interface
+ * @cap: channel capabilities
+ * @conf: channel configuration
+ * @dci: direct communication interface of hardware
+ * @hw_addr: MAC address of hardware
+ * @ep_address: endpoint address table
+ * @link_stat: link status of hardware
+ * @description: device description
+ * @suffix: suffix for channel name
+ * @anchor_list_lock: locks list access
+ * @padding_active: indicates channel uses padding
+ * @is_channel_healthy: health status table of each channel
+ * @anchor_list: list of anchored items
+ * @io_mutex: synchronize I/O with disconnect
+ * @link_stat_timer: timer for link status reports
+ * @poll_work_obj: work for polling link status
+ */
+struct most_dev {
+ struct kobject *parent;
+ struct usb_device *usb_device;
+ struct most_interface iface;
+ struct most_channel_capability *cap;
+ struct most_channel_config *conf;
+ struct most_dci_obj *dci;
+ u8 hw_addr[6];
+ u8 *ep_address;
+ u16 link_stat;
+ char description[MAX_STRING_LEN];
+ char suffix[MAX_NUM_ENDPOINTS][MAX_SUFFIX_LEN];
+ spinlock_t anchor_list_lock[MAX_NUM_ENDPOINTS];
+ bool padding_active[MAX_NUM_ENDPOINTS];
+ bool is_channel_healthy[MAX_NUM_ENDPOINTS];
+ struct list_head *anchor_list;
+ struct mutex io_mutex;
+ struct timer_list link_stat_timer;
+ struct work_struct poll_work_obj;
+};
+
+#define to_mdev(d) container_of(d, struct most_dev, iface)
+#define to_mdev_from_work(w) container_of(w, struct most_dev, poll_work_obj)
+
+static struct workqueue_struct *schedule_usb_work;
+static void wq_clear_halt(struct work_struct *wq_obj);
+static void wq_netinfo(struct work_struct *wq_obj);
+
+/**
+ * drci_rd_reg - read a DCI register
+ * @dev: usb device
+ * @reg: register address
+ * @buf: buffer to store data
+ *
+ * This is reads data from INIC's direct register communication interface
+ */
+static inline int drci_rd_reg(struct usb_device *dev, u16 reg, u16 *buf)
+{
+ int retval;
+ u16 *dma_buf = kzalloc(sizeof(u16), GFP_KERNEL);
+ u8 req_type = USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE;
+
+ if (!dma_buf)
+ return -ENOMEM;
+
+ retval = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+ DRCI_READ_REQ, req_type,
+ 0x0000,
+ reg, dma_buf, sizeof(u16), 5 * HZ);
+ *buf = le16_to_cpu(*dma_buf);
+ kfree(dma_buf);
+
+ return retval;
+}
+
+/**
+ * drci_wr_reg - write a DCI register
+ * @dev: usb device
+ * @reg: register address
+ * @data: data to write
+ *
+ * This is writes data to INIC's direct register communication interface
+ */
+static inline int drci_wr_reg(struct usb_device *dev, u16 reg, u16 data)
+{
+ return usb_control_msg(dev,
+ usb_sndctrlpipe(dev, 0),
+ DRCI_WRITE_REQ,
+ USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+ data,
+ reg,
+ NULL,
+ 0,
+ 5 * HZ);
+}
+
+/**
+ * free_anchored_buffers - free device's anchored items
+ * @mdev: the device
+ * @channel: channel ID
+ */
+static void free_anchored_buffers(struct most_dev *mdev, unsigned int channel)
+{
+ struct mbo *mbo;
+ struct buf_anchor *anchor, *tmp;
+ unsigned long flags;
+
+ spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
+ list_for_each_entry_safe(anchor, tmp, &mdev->anchor_list[channel],
+ list) {
+ struct urb *urb = anchor->urb;
+
+ spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
+ if (likely(urb)) {
+ mbo = urb->context;
+ if (!irqs_disabled()) {
+ usb_kill_urb(urb);
+ } else {
+ usb_unlink_urb(urb);
+ wait_for_completion(&anchor->urb_compl);
+ }
+ if ((mbo) && (mbo->complete)) {
+ mbo->status = MBO_E_CLOSE;
+ mbo->processed_length = 0;
+ mbo->complete(mbo);
+ }
+ usb_free_urb(urb);
+ }
+ spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
+ list_del(&anchor->list);
+ kfree(anchor);
+ }
+ spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
+}
+
+/**
+ * get_stream_frame_size - calculate frame size of current configuration
+ * @cfg: channel configuration
+ */
+static unsigned int get_stream_frame_size(struct most_channel_config *cfg)
+{
+ unsigned int frame_size = 0;
+ unsigned int sub_size = cfg->subbuffer_size;
+
+ if (!sub_size) {
+ pr_warn("Misconfig: Subbuffer size zero.\n");
+ return frame_size;
+ }
+ switch (cfg->data_type) {
+ case MOST_CH_ISOC_AVP:
+ frame_size = AV_PACKETS_PER_XACT * sub_size;
+ break;
+ case MOST_CH_SYNC:
+ if (cfg->packets_per_xact == 0) {
+ pr_warn("Misconfig: Packets per XACT zero\n");
+ frame_size = 0;
+ } else if (cfg->packets_per_xact == 0xFF) {
+ frame_size = (USB_MTU / sub_size) * sub_size;
+ } else {
+ frame_size = cfg->packets_per_xact * sub_size;
+ }
+ break;
+ default:
+ pr_warn("Query frame size of non-streaming channel\n");
+ break;
+ }
+ return frame_size;
+}
+
+/**
+ * hdm_poison_channel - mark buffers of this channel as invalid
+ * @iface: pointer to the interface
+ * @channel: channel ID
+ *
+ * This unlinks all URBs submitted to the HCD,
+ * calls the associated completion function of the core and removes
+ * them from the list.
+ *
+ * Returns 0 on success or error code otherwise.
+ */
+static int hdm_poison_channel(struct most_interface *iface, int channel)
+{
+ struct most_dev *mdev;
+
+ mdev = to_mdev(iface);
+ if (unlikely(!iface)) {
+ dev_warn(&mdev->usb_device->dev, "Poison: Bad interface.\n");
+ return -EIO;
+ }
+ if (unlikely((channel < 0) || (channel >= iface->num_channels))) {
+ dev_warn(&mdev->usb_device->dev, "Channel ID out of range.\n");
+ return -ECHRNG;
+ }
+
+ mdev->is_channel_healthy[channel] = false;
+
+ mutex_lock(&mdev->io_mutex);
+ free_anchored_buffers(mdev, channel);
+ if (mdev->padding_active[channel])
+ mdev->padding_active[channel] = false;
+
+ if (mdev->conf[channel].data_type == MOST_CH_ASYNC) {
+ del_timer_sync(&mdev->link_stat_timer);
+ cancel_work_sync(&mdev->poll_work_obj);
+ }
+ mutex_unlock(&mdev->io_mutex);
+ return 0;
+}
+
+/**
+ * hdm_add_padding - add padding bytes
+ * @mdev: most device
+ * @channel: channel ID
+ * @mbo: buffer object
+ *
+ * This inserts the INIC hardware specific padding bytes into a streaming
+ * channel's buffer
+ */
+static int hdm_add_padding(struct most_dev *mdev, int channel, struct mbo *mbo)
+{
+ struct most_channel_config *conf = &mdev->conf[channel];
+ unsigned int j, num_frames, frame_size;
+ u16 rd_addr, wr_addr;
+
+ frame_size = get_stream_frame_size(conf);
+ if (!frame_size)
+ return -EIO;
+ num_frames = mbo->buffer_length / frame_size;
+
+ if (num_frames < 1) {
+ dev_err(&mdev->usb_device->dev,
+ "Missed minimal transfer unit.\n");
+ return -EIO;
+ }
+
+ for (j = 1; j < num_frames; j++) {
+ wr_addr = (num_frames - j) * USB_MTU;
+ rd_addr = (num_frames - j) * frame_size;
+ memmove(mbo->virt_address + wr_addr,
+ mbo->virt_address + rd_addr,
+ frame_size);
+ }
+ mbo->buffer_length = num_frames * USB_MTU;
+ return 0;
+}
+
+/**
+ * hdm_remove_padding - remove padding bytes
+ * @mdev: most device
+ * @channel: channel ID
+ * @mbo: buffer object
+ *
+ * This takes the INIC hardware specific padding bytes off a streaming
+ * channel's buffer.
+ */
+static int hdm_remove_padding(struct most_dev *mdev, int channel,
+ struct mbo *mbo)
+{
+ unsigned int j, num_frames, frame_size;
+ struct most_channel_config *const conf = &mdev->conf[channel];
+
+ frame_size = get_stream_frame_size(conf);
+ if (!frame_size)
+ return -EIO;
+ num_frames = mbo->processed_length / USB_MTU;
+
+ for (j = 1; j < num_frames; j++)
+ memmove(mbo->virt_address + frame_size * j,
+ mbo->virt_address + USB_MTU * j,
+ frame_size);
+
+ mbo->processed_length = frame_size * num_frames;
+ return 0;
+}
+
+/**
+ * hdm_write_completion - completion function for submitted Tx URBs
+ * @urb: the URB that has been completed
+ *
+ * This checks the status of the completed URB. In case the URB has been
+ * unlinked before, it is immediately freed. On any other error the MBO
+ * transfer flag is set. On success it frees allocated resources and calls
+ * the completion function.
+ *
+ * Context: interrupt!
+ */
+static void hdm_write_completion(struct urb *urb)
+{
+ struct mbo *mbo;
+ struct buf_anchor *anchor;
+ struct most_dev *mdev;
+ struct device *dev;
+ unsigned int channel;
+ unsigned long flags;
+
+ mbo = urb->context;
+ anchor = mbo->priv;
+ mdev = to_mdev(mbo->ifp);
+ channel = mbo->hdm_channel_id;
+ dev = &mdev->usb_device->dev;
+
+ if ((urb->status == -ENOENT) || (urb->status == -ECONNRESET) ||
+ (!mdev->is_channel_healthy[channel])) {
+ complete(&anchor->urb_compl);
+ return;
+ }
+
+ if (unlikely(urb->status && !(urb->status == -ENOENT ||
+ urb->status == -ECONNRESET ||
+ urb->status == -ESHUTDOWN))) {
+ mbo->processed_length = 0;
+ switch (urb->status) {
+ case -EPIPE:
+ dev_warn(dev, "Broken OUT pipe detected\n");
+ most_stop_enqueue(&mdev->iface, channel);
+ mbo->status = MBO_E_INVAL;
+ usb_unlink_urb(urb);
+ INIT_WORK(&anchor->clear_work_obj, wq_clear_halt);
+ queue_work(schedule_usb_work, &anchor->clear_work_obj);
+ return;
+ case -ENODEV:
+ case -EPROTO:
+ mbo->status = MBO_E_CLOSE;
+ break;
+ default:
+ mbo->status = MBO_E_INVAL;
+ break;
+ }
+ } else {
+ mbo->status = MBO_SUCCESS;
+ mbo->processed_length = urb->actual_length;
+ }
+
+ spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
+ list_del(&anchor->list);
+ spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
+ kfree(anchor);
+
+ if (likely(mbo->complete))
+ mbo->complete(mbo);
+ usb_free_urb(urb);
+}
+
+/**
+ * hdm_read_completion - completion function for submitted Rx URBs
+ * @urb: the URB that has been completed
+ *
+ * This checks the status of the completed URB. In case the URB has been
+ * unlinked before it is immediately freed. On any other error the MBO transfer
+ * flag is set. On success it frees allocated resources, removes
+ * padding bytes -if necessary- and calls the completion function.
+ *
+ * Context: interrupt!
+ *
+ * **************************************************************************
+ * Error codes returned by in urb->status
+ * or in iso_frame_desc[n].status (for ISO)
+ * *************************************************************************
+ *
+ * USB device drivers may only test urb status values in completion handlers.
+ * This is because otherwise there would be a race between HCDs updating
+ * these values on one CPU, and device drivers testing them on another CPU.
+ *
+ * A transfer's actual_length may be positive even when an error has been
+ * reported. That's because transfers often involve several packets, so that
+ * one or more packets could finish before an error stops further endpoint I/O.
+ *
+ * For isochronous URBs, the urb status value is non-zero only if the URB is
+ * unlinked, the device is removed, the host controller is disabled or the total
+ * transferred length is less than the requested length and the URB_SHORT_NOT_OK
+ * flag is set. Completion handlers for isochronous URBs should only see
+ * urb->status set to zero, -ENOENT, -ECONNRESET, -ESHUTDOWN, or -EREMOTEIO.
+ * Individual frame descriptor status fields may report more status codes.
+ *
+ *
+ * 0 Transfer completed successfully
+ *
+ * -ENOENT URB was synchronously unlinked by usb_unlink_urb
+ *
+ * -EINPROGRESS URB still pending, no results yet
+ * (That is, if drivers see this it's a bug.)
+ *
+ * -EPROTO (*, **) a) bitstuff error
+ * b) no response packet received within the
+ * prescribed bus turn-around time
+ * c) unknown USB error
+ *
+ * -EILSEQ (*, **) a) CRC mismatch
+ * b) no response packet received within the
+ * prescribed bus turn-around time
+ * c) unknown USB error
+ *
+ * Note that often the controller hardware does not
+ * distinguish among cases a), b), and c), so a
+ * driver cannot tell whether there was a protocol
+ * error, a failure to respond (often caused by
+ * device disconnect), or some other fault.
+ *
+ * -ETIME (**) No response packet received within the prescribed
+ * bus turn-around time. This error may instead be
+ * reported as -EPROTO or -EILSEQ.
+ *
+ * -ETIMEDOUT Synchronous USB message functions use this code
+ * to indicate timeout expired before the transfer
+ * completed, and no other error was reported by HC.
+ *
+ * -EPIPE (**) Endpoint stalled. For non-control endpoints,
+ * reset this status with usb_clear_halt().
+ *
+ * -ECOMM During an IN transfer, the host controller
+ * received data from an endpoint faster than it
+ * could be written to system memory
+ *
+ * -ENOSR During an OUT transfer, the host controller
+ * could not retrieve data from system memory fast
+ * enough to keep up with the USB data rate
+ *
+ * -EOVERFLOW (*) The amount of data returned by the endpoint was
+ * greater than either the max packet size of the
+ * endpoint or the remaining buffer size. "Babble".
+ *
+ * -EREMOTEIO The data read from the endpoint did not fill the
+ * specified buffer, and URB_SHORT_NOT_OK was set in
+ * urb->transfer_flags.
+ *
+ * -ENODEV Device was removed. Often preceded by a burst of
+ * other errors, since the hub driver doesn't detect
+ * device removal events immediately.
+ *
+ * -EXDEV ISO transfer only partially completed
+ * (only set in iso_frame_desc[n].status, not urb->status)
+ *
+ * -EINVAL ISO madness, if this happens: Log off and go home
+ *
+ * -ECONNRESET URB was asynchronously unlinked by usb_unlink_urb
+ *
+ * -ESHUTDOWN The device or host controller has been disabled due
+ * to some problem that could not be worked around,
+ * such as a physical disconnect.
+ *
+ *
+ * (*) Error codes like -EPROTO, -EILSEQ and -EOVERFLOW normally indicate
+ * hardware problems such as bad devices (including firmware) or cables.
+ *
+ * (**) This is also one of several codes that different kinds of host
+ * controller use to indicate a transfer has failed because of device
+ * disconnect. In the interval before the hub driver starts disconnect
+ * processing, devices may receive such fault reports for every request.
+ *
+ * See <https://www.kernel.org/doc/Documentation/usb/error-codes.txt>
+ */
+static void hdm_read_completion(struct urb *urb)
+{
+ struct mbo *mbo;
+ struct buf_anchor *anchor;
+ struct most_dev *mdev;
+ struct device *dev;
+ unsigned long flags;
+ unsigned int channel;
+
+ mbo = urb->context;
+ anchor = mbo->priv;
+ mdev = to_mdev(mbo->ifp);
+ channel = mbo->hdm_channel_id;
+ dev = &mdev->usb_device->dev;
+
+ if ((urb->status == -ENOENT) || (urb->status == -ECONNRESET) ||
+ (!mdev->is_channel_healthy[channel])) {
+ complete(&anchor->urb_compl);
+ return;
+ }
+
+ if (unlikely(urb->status && !(urb->status == -ENOENT ||
+ urb->status == -ECONNRESET ||
+ urb->status == -ESHUTDOWN))) {
+ mbo->processed_length = 0;
+ switch (urb->status) {
+ case -EPIPE:
+ dev_warn(dev, "Broken IN pipe detected\n");
+ mbo->status = MBO_E_INVAL;
+ usb_unlink_urb(urb);
+ INIT_WORK(&anchor->clear_work_obj, wq_clear_halt);
+ queue_work(schedule_usb_work, &anchor->clear_work_obj);
+ return;
+ case -ENODEV:
+ case -EPROTO:
+ mbo->status = MBO_E_CLOSE;
+ break;
+ case -EOVERFLOW:
+ dev_warn(dev, "Babble on IN pipe detected\n");
+ default:
+ mbo->status = MBO_E_INVAL;
+ break;
+ }
+ } else {
+ mbo->processed_length = urb->actual_length;
+ if (!mdev->padding_active[channel]) {
+ mbo->status = MBO_SUCCESS;
+ } else {
+ if (hdm_remove_padding(mdev, channel, mbo)) {
+ mbo->processed_length = 0;
+ mbo->status = MBO_E_INVAL;
+ } else {
+ mbo->status = MBO_SUCCESS;
+ }
+ }
+ }
+ spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
+ list_del(&anchor->list);
+ spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
+ kfree(anchor);
+
+ if (likely(mbo->complete))
+ mbo->complete(mbo);
+ usb_free_urb(urb);
+}
+
+/**
+ * hdm_enqueue - receive a buffer to be used for data transfer
+ * @iface: interface to enqueue to
+ * @channel: ID of the channel
+ * @mbo: pointer to the buffer object
+ *
+ * This allocates a new URB and fills it according to the channel
+ * that is being used for transmission of data. Before the URB is
+ * submitted it is stored in the private anchor list.
+ *
+ * Returns 0 on success. On any error the URB is freed and a error code
+ * is returned.
+ *
+ * Context: Could in _some_ cases be interrupt!
+ */
+static int hdm_enqueue(struct most_interface *iface, int channel,
+ struct mbo *mbo)
+{
+ struct most_dev *mdev;
+ struct buf_anchor *anchor;
+ struct most_channel_config *conf;
+ struct device *dev;
+ int retval = 0;
+ struct urb *urb;
+ unsigned long flags;
+ unsigned long length;
+ void *virt_address;
+
+ if (unlikely(!iface || !mbo))
+ return -EIO;
+ if (unlikely(iface->num_channels <= channel) || (channel < 0))
+ return -ECHRNG;
+
+ mdev = to_mdev(iface);
+ conf = &mdev->conf[channel];
+ dev = &mdev->usb_device->dev;
+
+ if (!mdev->usb_device)
+ return -ENODEV;
+
+ urb = usb_alloc_urb(NO_ISOCHRONOUS_URB, GFP_ATOMIC);
+ if (!urb) {
+ dev_err(dev, "Failed to allocate URB\n");
+ return -ENOMEM;
+ }
+
+ anchor = kzalloc(sizeof(*anchor), GFP_ATOMIC);
+ if (!anchor) {
+ retval = -ENOMEM;
+ goto _error;
+ }
+
+ anchor->urb = urb;
+ init_completion(&anchor->urb_compl);
+ mbo->priv = anchor;
+
+ spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
+ list_add_tail(&anchor->list, &mdev->anchor_list[channel]);
+ spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
+
+ if ((mdev->padding_active[channel]) &&
+ (conf->direction & MOST_CH_TX))
+ if (hdm_add_padding(mdev, channel, mbo)) {
+ retval = -EIO;
+ goto _error_1;
+ }
+
+ urb->transfer_dma = mbo->bus_address;
+ virt_address = mbo->virt_address;
+ length = mbo->buffer_length;
+
+ if (conf->direction & MOST_CH_TX) {
+ usb_fill_bulk_urb(urb, mdev->usb_device,
+ usb_sndbulkpipe(mdev->usb_device,
+ mdev->ep_address[channel]),
+ virt_address,
+ length,
+ hdm_write_completion,
+ mbo);
+ if (conf->data_type != MOST_CH_ISOC_AVP)
+ urb->transfer_flags |= URB_ZERO_PACKET;
+ } else {
+ usb_fill_bulk_urb(urb, mdev->usb_device,
+ usb_rcvbulkpipe(mdev->usb_device,
+ mdev->ep_address[channel]),
+ virt_address,
+ length + conf->extra_len,
+ hdm_read_completion,
+ mbo);
+ }
+ urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+
+ retval = usb_submit_urb(urb, GFP_KERNEL);
+ if (retval) {
+ dev_err(dev, "URB submit failed with error %d.\n", retval);
+ goto _error_1;
+ }
+ return 0;
+
+_error_1:
+ spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
+ list_del(&anchor->list);
+ spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
+ kfree(anchor);
+_error:
+ usb_free_urb(urb);
+ return retval;
+}
+
+/**
+ * hdm_configure_channel - receive channel configuration from core
+ * @iface: interface
+ * @channel: channel ID
+ * @conf: structure that holds the configuration information
+ */
+static int hdm_configure_channel(struct most_interface *iface, int channel,
+ struct most_channel_config *conf)
+{
+ unsigned int num_frames;
+ unsigned int frame_size;
+ unsigned int temp_size;
+ unsigned int tail_space;
+ struct most_dev *mdev;
+ struct device *dev;
+
+ mdev = to_mdev(iface);
+ mdev->is_channel_healthy[channel] = true;
+ dev = &mdev->usb_device->dev;
+
+ if (unlikely(!iface || !conf)) {
+ dev_err(dev, "Bad interface or config pointer.\n");
+ return -EINVAL;
+ }
+ if (unlikely((channel < 0) || (channel >= iface->num_channels))) {
+ dev_err(dev, "Channel ID out of range.\n");
+ return -EINVAL;
+ }
+ if ((!conf->num_buffers) || (!conf->buffer_size)) {
+ dev_err(dev, "Misconfig: buffer size or #buffers zero.\n");
+ return -EINVAL;
+ }
+
+ if (!(conf->data_type == MOST_CH_SYNC) &&
+ !((conf->data_type == MOST_CH_ISOC_AVP) &&
+ (conf->packets_per_xact != 0xFF))) {
+ mdev->padding_active[channel] = false;
+ goto exit;
+ }
+
+ mdev->padding_active[channel] = true;
+ temp_size = conf->buffer_size;
+
+ frame_size = get_stream_frame_size(conf);
+ if ((frame_size == 0) || (frame_size > USB_MTU)) {
+ dev_warn(dev, "Misconfig: frame size wrong\n");
+ return -EINVAL;
+ }
+
+ if (conf->buffer_size % frame_size) {
+ u16 tmp_val;
+
+ tmp_val = conf->buffer_size / frame_size;
+ conf->buffer_size = tmp_val * frame_size;
+ dev_notice(dev,
+ "Channel %d - rounding buffer size to %d bytes, channel config says %d bytes\n",
+ channel,
+ conf->buffer_size,
+ temp_size);
+ }
+
+ num_frames = conf->buffer_size / frame_size;
+ tail_space = num_frames * (USB_MTU - frame_size);
+ temp_size += tail_space;
+
+ /* calculate extra length to comply w/ HW padding */
+ conf->extra_len = (CEILING(temp_size, USB_MTU) * USB_MTU)
+ - conf->buffer_size;
+exit:
+ mdev->conf[channel] = *conf;
+ return 0;
+}
+
+/**
+ * hdm_update_netinfo - retrieve latest networking information
+ * @mdev: device interface
+ *
+ * This triggers the USB vendor requests to read the hardware address and
+ * the current link status of the attached device.
+ */
+static int hdm_update_netinfo(struct most_dev *mdev)
+{
+ struct usb_device *usb_device = mdev->usb_device;
+ struct device *dev = &usb_device->dev;
+ u16 hi, mi, lo, link;
+
+ if (!is_valid_ether_addr(mdev->hw_addr)) {
+ if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_HI, &hi) < 0) {
+ dev_err(dev, "Vendor request \"hw_addr_hi\" failed\n");
+ return -1;
+ }
+
+ if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_MI, &mi) < 0) {
+ dev_err(dev, "Vendor request \"hw_addr_mid\" failed\n");
+ return -1;
+ }
+
+ if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_LO, &lo) < 0) {
+ dev_err(dev, "Vendor request \"hw_addr_low\" failed\n");
+ return -1;
+ }
+
+ mutex_lock(&mdev->io_mutex);
+ mdev->hw_addr[0] = hi >> 8;
+ mdev->hw_addr[1] = hi;
+ mdev->hw_addr[2] = mi >> 8;
+ mdev->hw_addr[3] = mi;
+ mdev->hw_addr[4] = lo >> 8;
+ mdev->hw_addr[5] = lo;
+ mutex_unlock(&mdev->io_mutex);
+ }
+
+ if (drci_rd_reg(usb_device, DRCI_REG_NI_STATE, &link) < 0) {
+ dev_err(dev, "Vendor request \"link status\" failed\n");
+ return -1;
+ }
+
+ mutex_lock(&mdev->io_mutex);
+ mdev->link_stat = link;
+ mutex_unlock(&mdev->io_mutex);
+ return 0;
+}
+
+/**
+ * hdm_request_netinfo - request network information
+ * @iface: pointer to interface
+ * @channel: channel ID
+ *
+ * This is used as trigger to set up the link status timer that
+ * polls for the NI state of the INIC every 2 seconds.
+ *
+ */
+static void hdm_request_netinfo(struct most_interface *iface, int channel)
+{
+ struct most_dev *mdev;
+
+ BUG_ON(!iface);
+ mdev = to_mdev(iface);
+ mdev->link_stat_timer.expires = jiffies + HZ;
+ mod_timer(&mdev->link_stat_timer, mdev->link_stat_timer.expires);
+}
+
+/**
+ * link_stat_timer_handler - add work to link_stat work queue
+ * @data: pointer to USB device instance
+ *
+ * The handler runs in interrupt context. That's why we need to defer the
+ * tasks to a work queue.
+ */
+static void link_stat_timer_handler(unsigned long data)
+{
+ struct most_dev *mdev = (struct most_dev *)data;
+
+ queue_work(schedule_usb_work, &mdev->poll_work_obj);
+ mdev->link_stat_timer.expires = jiffies + (2 * HZ);
+ add_timer(&mdev->link_stat_timer);
+}
+
+/**
+ * wq_netinfo - work queue function
+ * @wq_obj: object that holds data for our deferred work to do
+ *
+ * This retrieves the network interface status of the USB INIC
+ * and compares it with the current status. If the status has
+ * changed, it updates the status of the core.
+ */
+static void wq_netinfo(struct work_struct *wq_obj)
+{
+ struct most_dev *mdev;
+ int i, prev_link_stat;
+ u8 prev_hw_addr[6];
+
+ mdev = to_mdev_from_work(wq_obj);
+ prev_link_stat = mdev->link_stat;
+
+ for (i = 0; i < 6; i++)
+ prev_hw_addr[i] = mdev->hw_addr[i];
+
+ if (hdm_update_netinfo(mdev) < 0)
+ return;
+ if ((prev_link_stat != mdev->link_stat) ||
+ (prev_hw_addr[0] != mdev->hw_addr[0]) ||
+ (prev_hw_addr[1] != mdev->hw_addr[1]) ||
+ (prev_hw_addr[2] != mdev->hw_addr[2]) ||
+ (prev_hw_addr[3] != mdev->hw_addr[3]) ||
+ (prev_hw_addr[4] != mdev->hw_addr[4]) ||
+ (prev_hw_addr[5] != mdev->hw_addr[5]))
+ most_deliver_netinfo(&mdev->iface, mdev->link_stat,
+ &mdev->hw_addr[0]);
+}
+
+/**
+ * wq_clear_halt - work queue function
+ * @wq_obj: work_struct object to execute
+ *
+ * This sends a clear_halt to the given USB pipe.
+ */
+static void wq_clear_halt(struct work_struct *wq_obj)
+{
+ struct buf_anchor *anchor;
+ struct most_dev *mdev;
+ struct mbo *mbo;
+ struct urb *urb;
+ unsigned int channel;
+ unsigned long flags;
+
+ anchor = to_buf_anchor(wq_obj);
+ urb = anchor->urb;
+ mbo = urb->context;
+ mdev = to_mdev(mbo->ifp);
+ channel = mbo->hdm_channel_id;
+
+ if (usb_clear_halt(urb->dev, urb->pipe))
+ dev_warn(&mdev->usb_device->dev, "Failed to reset endpoint.\n");
+
+ usb_free_urb(urb);
+ spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
+ list_del(&anchor->list);
+ spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
+
+ if (likely(mbo->complete))
+ mbo->complete(mbo);
+ if (mdev->conf[channel].direction & MOST_CH_TX)
+ most_resume_enqueue(&mdev->iface, channel);
+
+ kfree(anchor);
+}
+
+/**
+ * hdm_usb_fops - file operation table for USB driver
+ */
+static const struct file_operations hdm_usb_fops = {
+ .owner = THIS_MODULE,
+};
+
+/**
+ * usb_device_id - ID table for HCD device probing
+ */
+static struct usb_device_id usbid[] = {
+ { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_BRDG), },
+ { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_INIC), },
+ { } /* Terminating entry */
+};
+
+#define MOST_DCI_RO_ATTR(_name) \
+ struct most_dci_attribute most_dci_attr_##_name = \
+ __ATTR(_name, S_IRUGO, show_value, NULL)
+
+#define MOST_DCI_ATTR(_name) \
+ struct most_dci_attribute most_dci_attr_##_name = \
+ __ATTR(_name, S_IRUGO | S_IWUSR, show_value, store_value)
+
+/**
+ * struct most_dci_attribute - to access the attributes of a dci object
+ * @attr: attributes of a dci object
+ * @show: pointer to the show function
+ * @store: pointer to the store function
+ */
+struct most_dci_attribute {
+ struct attribute attr;
+ ssize_t (*show)(struct most_dci_obj *d,
+ struct most_dci_attribute *attr,
+ char *buf);
+ ssize_t (*store)(struct most_dci_obj *d,
+ struct most_dci_attribute *attr,
+ const char *buf,
+ size_t count);
+};
+
+#define to_dci_attr(a) container_of(a, struct most_dci_attribute, attr)
+
+/**
+ * dci_attr_show - show function for dci object
+ * @kobj: pointer to kobject
+ * @attr: pointer to attribute struct
+ * @buf: buffer
+ */
+static ssize_t dci_attr_show(struct kobject *kobj, struct attribute *attr,
+ char *buf)
+{
+ struct most_dci_attribute *dci_attr = to_dci_attr(attr);
+ struct most_dci_obj *dci_obj = to_dci_obj(kobj);
+
+ if (!dci_attr->show)
+ return -EIO;
+
+ return dci_attr->show(dci_obj, dci_attr, buf);
+}
+
+/**
+ * dci_attr_store - store function for dci object
+ * @kobj: pointer to kobject
+ * @attr: pointer to attribute struct
+ * @buf: buffer
+ * @len: length of buffer
+ */
+static ssize_t dci_attr_store(struct kobject *kobj,
+ struct attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct most_dci_attribute *dci_attr = to_dci_attr(attr);
+ struct most_dci_obj *dci_obj = to_dci_obj(kobj);
+
+ if (!dci_attr->store)
+ return -EIO;
+
+ return dci_attr->store(dci_obj, dci_attr, buf, len);
+}
+
+static const struct sysfs_ops most_dci_sysfs_ops = {
+ .show = dci_attr_show,
+ .store = dci_attr_store,
+};
+
+/**
+ * most_dci_release - release function for dci object
+ * @kobj: pointer to kobject
+ *
+ * This frees the memory allocated for the dci object
+ */
+static void most_dci_release(struct kobject *kobj)
+{
+ struct most_dci_obj *dci_obj = to_dci_obj(kobj);
+
+ kfree(dci_obj);
+}
+
+static ssize_t show_value(struct most_dci_obj *dci_obj,
+ struct most_dci_attribute *attr, char *buf)
+{
+ u16 tmp_val;
+ u16 reg_addr;
+ int err;
+
+ if (!strcmp(attr->attr.name, "ni_state"))
+ reg_addr = DRCI_REG_NI_STATE;
+ else if (!strcmp(attr->attr.name, "packet_bandwidth"))
+ reg_addr = DRCI_REG_PACKET_BW;
+ else if (!strcmp(attr->attr.name, "node_address"))
+ reg_addr = DRCI_REG_NODE_ADDR;
+ else if (!strcmp(attr->attr.name, "node_position"))
+ reg_addr = DRCI_REG_NODE_POS;
+ else if (!strcmp(attr->attr.name, "mep_filter"))
+ reg_addr = DRCI_REG_MEP_FILTER;
+ else if (!strcmp(attr->attr.name, "mep_hash0"))
+ reg_addr = DRCI_REG_HASH_TBL0;
+ else if (!strcmp(attr->attr.name, "mep_hash1"))
+ reg_addr = DRCI_REG_HASH_TBL1;
+ else if (!strcmp(attr->attr.name, "mep_hash2"))
+ reg_addr = DRCI_REG_HASH_TBL2;
+ else if (!strcmp(attr->attr.name, "mep_hash3"))
+ reg_addr = DRCI_REG_HASH_TBL3;
+ else if (!strcmp(attr->attr.name, "mep_eui48_hi"))
+ reg_addr = DRCI_REG_HW_ADDR_HI;
+ else if (!strcmp(attr->attr.name, "mep_eui48_mi"))
+ reg_addr = DRCI_REG_HW_ADDR_MI;
+ else if (!strcmp(attr->attr.name, "mep_eui48_lo"))
+ reg_addr = DRCI_REG_HW_ADDR_LO;
+ else
+ return -EIO;
+
+ err = drci_rd_reg(dci_obj->usb_device, reg_addr, &tmp_val);
+ if (err < 0)
+ return err;
+
+ return snprintf(buf, PAGE_SIZE, "%04x\n", tmp_val);
+}
+
+static ssize_t store_value(struct most_dci_obj *dci_obj,
+ struct most_dci_attribute *attr,
+ const char *buf, size_t count)
+{
+ u16 val;
+ u16 reg_addr;
+ int err;
+
+ if (!strcmp(attr->attr.name, "mep_filter"))
+ reg_addr = DRCI_REG_MEP_FILTER;
+ else if (!strcmp(attr->attr.name, "mep_hash0"))
+ reg_addr = DRCI_REG_HASH_TBL0;
+ else if (!strcmp(attr->attr.name, "mep_hash1"))
+ reg_addr = DRCI_REG_HASH_TBL1;
+ else if (!strcmp(attr->attr.name, "mep_hash2"))
+ reg_addr = DRCI_REG_HASH_TBL2;
+ else if (!strcmp(attr->attr.name, "mep_hash3"))
+ reg_addr = DRCI_REG_HASH_TBL3;
+ else if (!strcmp(attr->attr.name, "mep_eui48_hi"))
+ reg_addr = DRCI_REG_HW_ADDR_HI;
+ else if (!strcmp(attr->attr.name, "mep_eui48_mi"))
+ reg_addr = DRCI_REG_HW_ADDR_MI;
+ else if (!strcmp(attr->attr.name, "mep_eui48_lo"))
+ reg_addr = DRCI_REG_HW_ADDR_LO;
+ else
+ return -EIO;
+
+ err = kstrtou16(buf, 16, &val);
+ if (err)
+ return err;
+
+ err = drci_wr_reg(dci_obj->usb_device, reg_addr, val);
+ if (err < 0)
+ return err;
+
+ return count;
+}
+
+static MOST_DCI_RO_ATTR(ni_state);
+static MOST_DCI_RO_ATTR(packet_bandwidth);
+static MOST_DCI_RO_ATTR(node_address);
+static MOST_DCI_RO_ATTR(node_position);
+static MOST_DCI_ATTR(mep_filter);
+static MOST_DCI_ATTR(mep_hash0);
+static MOST_DCI_ATTR(mep_hash1);
+static MOST_DCI_ATTR(mep_hash2);
+static MOST_DCI_ATTR(mep_hash3);
+static MOST_DCI_ATTR(mep_eui48_hi);
+static MOST_DCI_ATTR(mep_eui48_mi);
+static MOST_DCI_ATTR(mep_eui48_lo);
+
+/**
+ * most_dci_def_attrs - array of default attribute files of the dci object
+ */
+static struct attribute *most_dci_def_attrs[] = {
+ &most_dci_attr_ni_state.attr,
+ &most_dci_attr_packet_bandwidth.attr,
+ &most_dci_attr_node_address.attr,
+ &most_dci_attr_node_position.attr,
+ &most_dci_attr_mep_filter.attr,
+ &most_dci_attr_mep_hash0.attr,
+ &most_dci_attr_mep_hash1.attr,
+ &most_dci_attr_mep_hash2.attr,
+ &most_dci_attr_mep_hash3.attr,
+ &most_dci_attr_mep_eui48_hi.attr,
+ &most_dci_attr_mep_eui48_mi.attr,
+ &most_dci_attr_mep_eui48_lo.attr,
+ NULL,
+};
+
+/**
+ * DCI ktype
+ */
+static struct kobj_type most_dci_ktype = {
+ .sysfs_ops = &most_dci_sysfs_ops,
+ .release = most_dci_release,
+ .default_attrs = most_dci_def_attrs,
+};
+
+/**
+ * create_most_dci_obj - allocates a dci object
+ * @parent: parent kobject
+ *
+ * This creates a dci object and registers it with sysfs.
+ * Returns a pointer to the object or NULL when something went wrong.
+ */
+static struct
+most_dci_obj *create_most_dci_obj(struct kobject *parent)
+{
+ struct most_dci_obj *most_dci;
+ int retval;
+
+ most_dci = kzalloc(sizeof(*most_dci), GFP_KERNEL);
+ if (!most_dci)
+ return NULL;
+
+ retval = kobject_init_and_add(&most_dci->kobj, &most_dci_ktype, parent,
+ "dci");
+ if (retval) {
+ kobject_put(&most_dci->kobj);
+ return NULL;
+ }
+ return most_dci;
+}
+
+/**
+ * destroy_most_dci_obj - DCI object release function
+ * @p: pointer to dci object
+ */
+static void destroy_most_dci_obj(struct most_dci_obj *p)
+{
+ kobject_put(&p->kobj);
+}
+
+/**
+ * hdm_probe - probe function of USB device driver
+ * @interface: Interface of the attached USB device
+ * @id: Pointer to the USB ID table.
+ *
+ * This allocates and initializes the device instance, adds the new
+ * entry to the internal list, scans the USB descriptors and registers
+ * the interface with the core.
+ * Additionally, the DCI objects are created and the hardware is sync'd.
+ *
+ * Return 0 on success. In case of an error a negative number is returned.
+ */
+static int
+hdm_probe(struct usb_interface *interface, const struct usb_device_id *id)
+{
+ unsigned int i;
+ unsigned int num_endpoints;
+ struct most_channel_capability *tmp_cap;
+ struct most_dev *mdev;
+ struct usb_device *usb_dev;
+ struct device *dev;
+ struct usb_host_interface *usb_iface_desc;
+ struct usb_endpoint_descriptor *ep_desc;
+ int ret = 0;
+ int err;
+
+ usb_iface_desc = interface->cur_altsetting;
+ usb_dev = interface_to_usbdev(interface);
+ dev = &usb_dev->dev;
+ mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
+ if (!mdev)
+ goto exit_ENOMEM;
+
+ usb_set_intfdata(interface, mdev);
+ num_endpoints = usb_iface_desc->desc.bNumEndpoints;
+ mutex_init(&mdev->io_mutex);
+ INIT_WORK(&mdev->poll_work_obj, wq_netinfo);
+ setup_timer(&mdev->link_stat_timer, link_stat_timer_handler,
+ (unsigned long)mdev);
+
+ mdev->usb_device = usb_dev;
+ mdev->link_stat_timer.expires = jiffies + (2 * HZ);
+
+ mdev->iface.mod = hdm_usb_fops.owner;
+ mdev->iface.interface = ITYPE_USB;
+ mdev->iface.configure = hdm_configure_channel;
+ mdev->iface.request_netinfo = hdm_request_netinfo;
+ mdev->iface.enqueue = hdm_enqueue;
+ mdev->iface.poison_channel = hdm_poison_channel;
+ mdev->iface.description = mdev->description;
+ mdev->iface.num_channels = num_endpoints;
+
+ snprintf(mdev->description, sizeof(mdev->description),
+ "usb_device %d-%s:%d.%d",
+ usb_dev->bus->busnum,
+ usb_dev->devpath,
+ usb_dev->config->desc.bConfigurationValue,
+ usb_iface_desc->desc.bInterfaceNumber);
+
+ mdev->conf = kcalloc(num_endpoints, sizeof(*mdev->conf), GFP_KERNEL);
+ if (!mdev->conf)
+ goto exit_free;
+
+ mdev->cap = kcalloc(num_endpoints, sizeof(*mdev->cap), GFP_KERNEL);
+ if (!mdev->cap)
+ goto exit_free1;
+
+ mdev->iface.channel_vector = mdev->cap;
+ mdev->iface.priv = NULL;
+
+ mdev->ep_address =
+ kcalloc(num_endpoints, sizeof(*mdev->ep_address), GFP_KERNEL);
+ if (!mdev->ep_address)
+ goto exit_free2;
+
+ mdev->anchor_list =
+ kcalloc(num_endpoints, sizeof(*mdev->anchor_list), GFP_KERNEL);
+ if (!mdev->anchor_list)
+ goto exit_free3;
+
+ tmp_cap = mdev->cap;
+ for (i = 0; i < num_endpoints; i++) {
+ ep_desc = &usb_iface_desc->endpoint[i].desc;
+ mdev->ep_address[i] = ep_desc->bEndpointAddress;
+ mdev->padding_active[i] = false;
+ mdev->is_channel_healthy[i] = true;
+
+ snprintf(&mdev->suffix[i][0], MAX_SUFFIX_LEN, "ep%02x",
+ mdev->ep_address[i]);
+
+ tmp_cap->name_suffix = &mdev->suffix[i][0];
+ tmp_cap->buffer_size_packet = MAX_BUF_SIZE;
+ tmp_cap->buffer_size_streaming = MAX_BUF_SIZE;
+ tmp_cap->num_buffers_packet = BUF_CHAIN_SIZE;
+ tmp_cap->num_buffers_streaming = BUF_CHAIN_SIZE;
+ tmp_cap->data_type = MOST_CH_CONTROL | MOST_CH_ASYNC |
+ MOST_CH_ISOC_AVP | MOST_CH_SYNC;
+ if (ep_desc->bEndpointAddress & USB_DIR_IN)
+ tmp_cap->direction = MOST_CH_RX;
+ else
+ tmp_cap->direction = MOST_CH_TX;
+ tmp_cap++;
+ INIT_LIST_HEAD(&mdev->anchor_list[i]);
+ spin_lock_init(&mdev->anchor_list_lock[i]);
+ err = drci_wr_reg(usb_dev,
+ DRCI_REG_BASE + DRCI_COMMAND +
+ ep_desc->bEndpointAddress * 16,
+ 1);
+ if (err < 0)
+ pr_warn("DCI Sync for EP %02x failed",
+ ep_desc->bEndpointAddress);
+ }
+ dev_notice(dev, "claimed gadget: Vendor=%4.4x ProdID=%4.4x Bus=%02x Device=%02x\n",
+ le16_to_cpu(usb_dev->descriptor.idVendor),
+ le16_to_cpu(usb_dev->descriptor.idProduct),
+ usb_dev->bus->busnum,
+ usb_dev->devnum);
+
+ dev_notice(dev, "device path: /sys/bus/usb/devices/%d-%s:%d.%d\n",
+ usb_dev->bus->busnum,
+ usb_dev->devpath,
+ usb_dev->config->desc.bConfigurationValue,
+ usb_iface_desc->desc.bInterfaceNumber);
+
+ mdev->parent = most_register_interface(&mdev->iface);
+ if (IS_ERR(mdev->parent)) {
+ ret = PTR_ERR(mdev->parent);
+ goto exit_free4;
+ }
+
+ mutex_lock(&mdev->io_mutex);
+ if (le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_INIC) {
+ /* this increments the reference count of the instance
+ * object of the core
+ */
+ mdev->dci = create_most_dci_obj(mdev->parent);
+ if (!mdev->dci) {
+ mutex_unlock(&mdev->io_mutex);
+ most_deregister_interface(&mdev->iface);
+ ret = -ENOMEM;
+ goto exit_free4;
+ }
+
+ kobject_uevent(&mdev->dci->kobj, KOBJ_ADD);
+ mdev->dci->usb_device = mdev->usb_device;
+ }
+ mutex_unlock(&mdev->io_mutex);
+ return 0;
+
+exit_free4:
+ kfree(mdev->anchor_list);
+exit_free3:
+ kfree(mdev->ep_address);
+exit_free2:
+ kfree(mdev->cap);
+exit_free1:
+ kfree(mdev->conf);
+exit_free:
+ kfree(mdev);
+exit_ENOMEM:
+ if (ret == 0 || ret == -ENOMEM) {
+ ret = -ENOMEM;
+ dev_err(dev, "out of memory\n");
+ }
+ return ret;
+}
+
+/**
+ * hdm_disconnect - disconnect function of USB device driver
+ * @interface: Interface of the attached USB device
+ *
+ * This deregisters the interface with the core, removes the kernel timer
+ * and frees resources.
+ *
+ * Context: hub kernel thread
+ */
+static void hdm_disconnect(struct usb_interface *interface)
+{
+ struct most_dev *mdev;
+
+ mdev = usb_get_intfdata(interface);
+ mutex_lock(&mdev->io_mutex);
+ usb_set_intfdata(interface, NULL);
+ mdev->usb_device = NULL;
+ mutex_unlock(&mdev->io_mutex);
+
+ del_timer_sync(&mdev->link_stat_timer);
+ cancel_work_sync(&mdev->poll_work_obj);
+
+ destroy_most_dci_obj(mdev->dci);
+ most_deregister_interface(&mdev->iface);
+
+ kfree(mdev->anchor_list);
+ kfree(mdev->cap);
+ kfree(mdev->conf);
+ kfree(mdev->ep_address);
+ kfree(mdev);
+}
+
+static struct usb_driver hdm_usb = {
+ .name = "hdm_usb",
+ .id_table = usbid,
+ .probe = hdm_probe,
+ .disconnect = hdm_disconnect,
+};
+
+static int __init hdm_usb_init(void)
+{
+ pr_info("hdm_usb_init()\n");
+ if (usb_register(&hdm_usb)) {
+ pr_err("could not register hdm_usb driver\n");
+ return -EIO;
+ }
+ schedule_usb_work = create_workqueue("hdmu_work");
+ if (!schedule_usb_work) {
+ pr_err("could not create workqueue\n");
+ usb_deregister(&hdm_usb);
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+static void __exit hdm_usb_exit(void)
+{
+ pr_info("hdm_usb_exit()\n");
+ destroy_workqueue(schedule_usb_work);
+ usb_deregister(&hdm_usb);
+}
+
+module_init(hdm_usb_init);
+module_exit(hdm_usb_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>");
+MODULE_DESCRIPTION("HDM_4_USB");
diff --git a/recipes-kernel/hdm-usb/hdm-usb.bb b/recipes-kernel/hdm-usb/hdm-usb.bb
new file mode 100644
index 000000000..603ea3273
--- /dev/null
+++ b/recipes-kernel/hdm-usb/hdm-usb.bb
@@ -0,0 +1,22 @@
+DESCRIPTION = "Example of how to build an external Linux kernel module"
+LICENSE = "GPLv2"
+LIC_FILES_CHKSUM = "file://COPYING;md5=12f884d2ae1ff87c09e5b7ccc2c4ca7e \
+ file://hdm_usb.c;md5=ff660625252cda55e5bc409632fc8a78 \
+ "
+
+inherit module
+
+PR = "r0"
+PV = "0.1"
+
+SRC_URI = "file://Makefile \
+ file://../../aim-network/files/networking.h \
+ file://../../mostcore/files/mostcore.h \
+ file://hdm_usb.c \
+ file://COPYING \
+ "
+
+S = "${WORKDIR}"
+
+# The inherit of module.bbclass will automatically name module packages with
+# "kernel-module-" prefix as required by the oe-core build environment.